多项选择题 从下列有关SPOOLing系统的论述中，选择两条正确的论述。

单项选择题 关于IP板特性，描述不当的是（）

多项选择题 The basis of decline curve analysis is that future production continues to follow the past trend, we can use these models to estimate ( ).A.original gas in placeB.ultimate gas reservesC.remaining productive lifeD.formation permeabilityE.skin factor